No I haven't, but I will! that's great because I love anything Cole Haan!Have you tried the cole haan air nike soles? They are supposed to be so comfortable. I would also try lots of different brands because one might fit your feet better than another. Wedges might also be an option for you. You should definately invest a comfortable pair of flats and a great pair of basic heels. Shoe sizes never change!!
right now, the ONLY comfy pair of flats I have are by Kenneth Cole, called Gentle Souls - they have this cool padding which really helps with my high arch!